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# how do you solve 2/3b - 3 = 15?

I was told the answer is -18, but not sure how to get there...please help

### 11 Answers

- 1 decade ago
You are solving for b right?

(2/3)b - 3 = 15

Bring the 3 to the right by adding 3 to both sides:

(2/3)b = 18

Bring the 3 in the denominator to the right by multiplying 3 to both sides:

2b = 54

Bring the 2 to the right by dividing 2 by both sides:

b = 27

So the answer should be 27... unless the question is actually -15 instead of +15, THEN b would be -18.

- Anonymous1 decade ago
The answer is definitely not -18 since:

2/3b - 3 = 15

Shifting -3 to the RHS

2/3b = 15 + 3

Bringing (15+3) to LHS and 3b to RHS

2/18 = 3b

b = 0.037

- 1 decade ago
2/3b - 3 = 15 (take -3 to other side, and negative becomes positive so add to 15)

2/3b = 18

therefore b = 3/2 x 18 = 27

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- 1 decade ago
2/3b - 3 = 15

Solution:

2/3b = 15 + 3

2/3b = 18

2 = (3b)(18)

2 = 54b

b = 1/27

If it is (2/3)b - 3 = 15

Solution:

(2/3)b = 15 + 3

(2/3)b = 18

b = 18 (3/2)

b = 27

- Anonymous1 decade ago
2/3b - 3 = 15

2/3b = 15+ 3

2b = 18*3

b = 54/2

b = 27

as you see -18 is horribly wrong. also 2/3b = (2b)/3

- An ESL LearnerLv 71 decade ago
2/3(b) - 3 = 15

2b/3 - 3 = 15

2b/3 = 15 + 3

2b = 3(18)

2b = 54

b = 54/2

b = 27

- PattyAnnLv 71 decade ago
Look how many people are willing to do your homework. You were told the answer and the process. Why do we pay teachers? :-)